Square D DD240 thermal overload relay element is a melting-alloy heater replacement used inside Square D thermal overload relays to provide the temperature-based trip that protects motors. The DD240.0 heater is listed as the replacement thermal unit for use with compatible Square D overload relays, with the trip current determined by the matched relay model. Retail listings sometimes reference the part with variations such as DD240 or 58883, and the product is commonly described as a replacement overload heater for Square D systems. Verify compatibility with your exact overload relay model before ordering.
